Is it normal?

At my last appointment I was told I am 100% and 3 cm with baby being very low and cervix being very soft. My question is shouldn't I feel something if I am 3 cm? My stomach tightens but I haven't felt any pain so I assumed I just have a lot of BH's. I'm worried I am not going to know when I am actually in labor if things continue like this! I'm 39 weeks today and feeling nothing but the steady BH's that I've had for weeks now. =/